5VTP 1.25-R Equivalent & Substitute Parts

Part Overview

The 5VTP 1.25-R is a 1.25 A 250 V AC/DC fuse cartridge manufactured by Bel Fuse Inc. in a 5mm x 20mm glass through-hole package with slow-blow response characteristics. This part is classified as obsolete, making identification of equivalent substitute components necessary for ongoing system maintenance and new design implementations. Substitute parts must maintain identical electrical ratings and mechanical compatibility to ensure proper circuit protection without modification to existing designs.

Substiute Parts

5VTP 1.25-R

Bel Fuse Inc.In Stock: 10845VTP 1.25-R Datasheet

Current PartRFQ

02131.25MXEP

Littelfuse Inc.In Stock: 87102131.25MXEP Datasheet

DirectRFQ

02181.25MXEP

Littelfuse Inc.In Stock: 72802181.25MXEP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5VTP 1.25-R is determined by strict equivalence across the following parameters:

• Current Rating: 1.25 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Package / Case: 5mm x 20mm (Axial) (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity @ Rated Voltage: 35 A (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

Two substitute parts meet these criteria: Littelfuse Inc. 02131.25MXEP (Series 213) and Littelfuse Inc. 02181.25MXEP (Series 218). Both are active products with full regulatory compliance and identical electrical and mechanical specifications to the main part.

Parameter Comparison

Engineering Selection Recommendations

Both Littelfuse substitute parts are suitable direct replacements for the obsolete 5VTP 1.25-R. The 02131.25MXEP (Series 213) and 02181.25MXEP (Series 218) are active products with comprehensive regulatory approvals including CCC, CE, CSA, and VDE certifications. Both maintain full RoHS3 compliance and REACH unaffected status. Selection between the two Littelfuse alternatives may be based on availability, as both are electrically and mechanically equivalent to the original part. The transition from the obsolete Bel Fuse part to either active Littelfuse substitute eliminates supply chain risk while maintaining circuit protection performance.

Frequently Asked Questions (FAQ)

Q: Can 02131.25MXEP and 02181.25MXEP be used interchangeably with 5VTP 1.25-R?

A: Yes. Both Littelfuse parts are direct substitutes. They share identical current ratings (1.25 A), voltage ratings (250 V AC), fuse type (cartridge glass), package dimensions (5mm x 20mm), response time (slow blow), and breaking capacity (35 A). No circuit modifications are required.

Q: What is the difference between the two Littelfuse substitute parts?

A: The 02131.25MXEP (Series 213) and 02181.25MXEP (Series 218) differ in melting I²t values (27.15 vs. 12.65) and DC cold resistance (0.0817 vs. 0.0446 Ohms). These internal characteristics do not affect substitution eligibility, as both maintain the same electrical ratings and response time classification.

Q: Why is the original 5VTP 1.25-R listed as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Bel Fuse Inc. The listed substitute parts from Littelfuse Inc. are active products with ongoing production and supply availability.

Q: Are there any compliance or certification differences between the main part and substitutes?

A: All three parts are RoHS3 compliant and REACH unaffected. The substitute parts carry additional certifications (BSI, PSE, UR, K-MARK, UL) beyond those of the original part, providing broader regulatory coverage.

Q: Can these fuses be used in both AC and DC circuits?

A: Yes. All three parts are rated for 250 V AC/DC operation, making them suitable for both alternating and direct current applications within the specified voltage and current limits.